US3879185A - Apparatus for lengthening cylindrical workpieces - Google Patents

Apparatus for lengthening cylindrical workpieces Download PDF

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Publication number
US3879185A
US3879185A US410383A US41038373A US3879185A US 3879185 A US3879185 A US 3879185A US 410383 A US410383 A US 410383A US 41038373 A US41038373 A US 41038373A US 3879185 A US3879185 A US 3879185A
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United States
Prior art keywords
workpieces
stretching
extremities
disks
members
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Expired - Lifetime
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US410383A
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English (en)
Inventor
Maurice Sade
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Comptoir Lyonnais de Verrerie
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Comptoir Lyonnais de Verrerie
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Publication date
Priority to FR7238862A priority Critical patent/FR2204581B1/fr
Priority to DE19732352921 priority patent/DE2352921A1/de
Priority to GB4953773A priority patent/GB1408229A/en
Application filed by Comptoir Lyonnais de Verrerie filed Critical Comptoir Lyonnais de Verrerie
Priority to US410383A priority patent/US3879185A/en
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Publication of US3879185A publication Critical patent/US3879185A/en
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/04—Re-forming tubes or rods
    • C03B23/047—Re-forming tubes or rods by drawing
    • C03B23/0473—Re-forming tubes or rods by drawing for forming constrictions

Definitions

  • Tubular glass blanks to be formed into pipettes are parallel transport rollers each comprising two coaxial disks with peripheral notches designed to receive the blanks.
  • the transport rollers carry the blanks through APPARATUS FOR LENGTHENING CYLINDRICAL WORKPIECES Inventor: Maurice Sade. Lyon. France Assignee: Comptoir Lyonnais de Verrerie.
  • My present invention relates to an apparatus for lengthening cylindrical workpieces of a thermally softenable material, such as glass. e.g.. for the purpose of forming pipettes from glass tubes after they have been heated in their central portion which thus becomes elongated and reduced in diameter; by severing this central portion upon subsequent cooling, two symmetrical pipettes are obtained which can be used to pick up doses of liquids or viscous media.
  • a glass tube is first held above the flame to heat its central portion and is stretched after being removed from the flame until the diameter of that central portion is reduced to the desired extent. Under optimum working conditions, to pipettes per minute can be produced in this fashion.
  • the general object of my present invention is to provide an improved system for automatically lengthening glass tubes or similar workpieces in a symmetrical manner, with a reduction in thickness at the center, while avoiding the aforementioned drawbacks.
  • a more specific object is to provide simple and efficient machinery for producing pairs of pipettes at a high rate.
  • a first station including feed means for advancing a succession of such workpieces along a predetermined path, with heating of the midportions of the advancing workpieces
  • a second station including a pair of rotatable stretching members whose planes of rotation diverge in the direction of a continuation of that path.
  • the stretching members are provided with peripheral formations, such as notches, for gripping the extremities of the centrally heated workpieces, arriving from the first station, and for progressively separating these extremities by advancing the workpieces along an imaginary cylinder surface having a centerline transverse to the direction of advance; in a preferred em bodiment. in which these stretching members are designed as a pair of rollers (referred to hereinafter as drawing rollers). This imaginary cylinder surface has an elliptical cross-section.
  • the stretched workpieces are successively unloaded on leaving the second station.
  • each of the two drawing rollers (whose axes converge in the direction of advance of the workpieces) comprises a pair of axially' spaced corotating notched disks and a support wheel sandwiched therebetween.
  • each roller being partly encircled by a stationary arcuate guide element located in the vicinity of the corresponding support wheel which peripherally contacts the workpiece extremities lodged in the notches of the disks.
  • the support wheels ⁇ or at least one of them may be rotated at a speed different from that of the associated disks and may be provided with a peripheral friction layer, such as a rubber band. for setting the workpieces in rotation about their individual axes in order to insure uniform stretching.
  • the two disks and the support wheel of each of these rollers must rotate about relatively offset axes; their midpoints, however. should all be located on a common transverse line representing the centerline or axis of the imaginary elliptical cylinder surface enveloping these rollers.
  • the feed means of the first station may comprise a pair of generally similar rollers, hereinafter referred to as transport rollers, which in contradistinction to the drawing rollers are disposed coaxially and which therefore may be mounted on a common shaft.
  • Each transport roller advantageously has the same general construction as the drawing rollers ⁇ with a support wheel sandwiched between a pair of peripherally notched disks.
  • the support wheels of the transport rollers (or at least one of them) may be provided with peripheral friction layers and may be driven at a speed different from that of the associated disks to impart rotation to the peripherally engaged workpieces, such rotation in this instance serving to insure uniform heating.
  • a common drive means which may also serve to rotate the workpiece-engaging traction wheels, e.g., via a gear transmission between these wheels and adjoining disks.
  • FIG. l is a top plan view (with parts broken away) of a machine for making pipettes in accordance with my invention.
  • FIG. 2 is a cross-sectional view taken on the line Il-Il of FIG. 1.
  • the system shown yin the drawing comprises a feeding station 2 and a stretching station 4, the two stations meeting at a transfer point A.
  • Workpieces 56 in the form of tubular glass blanks, are successively delivered at an input C to feeding station 2 and, after transformation into enlongated bodies 65, are unloaded at an exit B.
  • the loading and unloading means have been illustrated as chutes 60 and 66, respectively.
  • Feeding station V2 comprises a pair of coaxial transport rollers 30a, 3017, on a common shaft 36, consisting each of a pair of ⁇ axially spaced disks 32a' ⁇ 32a" and 32h', 32h" provided with peripheral notches 35. These angularly cquispaced notches are all aligned. in a direction parallel to the disk axis, in order to receive the extremities of the oncoming blanks 56 which are to be transported over an arc ofa little more than 180 by the disks whose clockwise rotation. as viewed in FIG. 2, has been indicated by anarrow 62.
  • the blanks or workpieces 56 are retained in the notches 35 by stationary arcuate guide elements 34a, 34h which partly encircle respective support wheels 33a, 33b coaxially sandwiched between the disk pairs 32a. 32a" and 32h'. 32h".
  • Wheels 33a and 33b are freely' journaled on the shaft 36, in a manner more fully described hereinafter with particular reference to wheel 33a, so as to be rotatable at a speed different from that of the disks.
  • a rubber band or tire 67 forms a friction layer on the circumference of at least the wheel 30a and engages the workpiece extremities from within whereby, in response to relative rotation of the wheel and the disks, the blanks 56 lodged in notches 35 are made to turn about their individual axes parallel to the disk axis.
  • This rotation of the blanks insures the uniform heating of their central portions by a set of burners 58 mounted in an arcuate array in a heating zone 3 on the guide elements 34a ⁇ 34h underneath the transport rollers 30a, 30h: for the sake of clarity only one such burner has been illustrated in FIG. l.
  • the drive for the disks 32a', 32a" and 32b, 33h" includes a worm 25, powered by a nonillustrated motor, which meshes with a worm gear 24 keyed at the foot of a tubular column 22b' to a vertical shaft 2lb' along with a gear 44 which in turn engages a gear 43 on ariother vertical shaft 39, the latter being journaled in a tubular column'40.
  • a worm 38 keyed to shaft 39 meshes with a worm gear 37 keyed to shaft 36.
  • a gear 50 which together with the several disks is rotatably entrained by the shaft 36, has a hub 52 on which the support and traction wheel 33a is journaled so as to be rotatable relatively to the shaft; gear 50 meshes with a set of teeth (of relatively small diameter) on a stepped pinion 46 having another set of teeth (of relatively large diameter) in mesh with a gear 53 which is rigid with wheel 33a.
  • Pinion 46 is journaled on a stub shaft 47 which is mounted in a bracket 48 depending from an adjustable plate 49.
  • the companion wheel 33b is advantageously driven from shaft 36 through a similar gear transmission not shown.
  • Stretching station 4 comprises a pair of drawing rollers 5a, 5b whose axes converge in the direction of workpiece advance indicated by an arrow D in FIG. l; these axes and that of shaft 36 lie in a common plane P (FIG. 2).
  • the construction of each drawing roller 5a, 5b is generally similar to that of the transport rollers a, sob, except that the disks 7a', 7a" and 7b', 7b" of these drawing rollers are axially offset from each other in order to position the midpoints or centers of these disks on a common line X-X' perpendicular to the direction D.
  • Line X-X' which is also transverse to a central plane of symmetry parallel to transport rollers 30a, 30h.
  • each of these wheels is rotatably journaled on a hub 16 carried by a bracket 68 which is suspended from a slider l2 also supporting the associated guide elements 10a, 10b; the latter are constituted by respective pairs of arcuate rails with relatively offset centers of curvature lying on the line X-X'.
  • each disk is mounted on separate shafts 9a', 9a" and 9b', 9b".
  • the shafts of each pair are disposed symmetrically with reference to the hub 16 of the associated support wheel.
  • either or preferably both support wheels 14a, )4b are positively driven through a step-up transmission, similar to that described above with reference to wheel 33a, which in the specific instance of wheel 14a includes a set of gear teeth 153 on that wheel meshing with a nonillustrated steppcd pinion also engaging a set of gear teeth 150 on disk 7a'.
  • Shaft 9b which is representative of all four disk shafts, is shown journaled in a bearing 17 within a housing 18 forming an extension of a column 22b similar to columns l22b and 40, two other such columns 22a', 22a" being provided for the drives of disks 7a and 7a".
  • 'Shaft 9b" carries a worm gear 19 in mesh with a worm 20 on a shaft 2lb" which, through a nonillustrated gear train in machine bed 23, is coupled with gear 44 on shaft 2lb.
  • the wheel-supporting sliders l2 (only one shown) ⁇ integral with mounting plates 49. are adjustably mounted on a horizontal bar 13 to which they' are fastened by screws 69 with a relative spacing depending upon the length of the oncoming blanks 56; columns 22a', 22a", 22b' and 22h" are similarly adjustable by having their bases 26 (as illustrated for column 2212') releasably clamped with the aid of lugs 28 to the machine bed 23 along which they can be laterally' displaced to vary the length d of the central blank portions.
  • Column 40 has a base 42 secured to the bed 23 by screws 70 (only one shown); transport rollers 30a and 30h, however ⁇ can be shifted along shaft 36 in accordance with the lateral displacement of drawing rollers 5a and 5b.
  • the guide elements 10a and 10b. which are mounted on the sliders 12 with the aid of screws 7l, can be replaced by other guide elements of different arc length if it is desired to increase or reduce the degree of elongation of the workpieces.
  • the maximum arc length between transfer point A and exit point B is 180 since the peripheral spacing of the drawing rollers decreases along the lower half of the drawing rollers whose counterclockwise rotation has been indicated by arrow 63 in FIG. 2.
  • An apparatus for lengthening cylindrical workpieces of a thermally softenable material comprising:
  • stretching means and conveying means for transferring the workpieces to said stretching means;
  • said conveying means including a pair of parallel rotatable feed members provided with equispaced peripheral notches engageable with respective extremities of a succession of said workpieces;
  • heating means between said feed members for thermally softening the midportions of the workpieces so engaged
  • said stretching means including a pair of rotatable stretching members provided with equispaced peripheral notches engageable with said extremities ⁇ said stretching members having their peripheries located in respective planes of rotation which diverge in opposite directions from a central plane parallel to said feed members, the peripheries of said stretching members approaching the lperipheries of said feed members at a transfer point for gripping the extremities of the thermally softened workpieces and progressively separating said extremities while advancing said workpieces with their axes moving along part of an imaginary cylinder surface having a centerline transverse to said central plane;
  • stretching members are a pair of drawing rollers centered on axes converging in a direction away from said conveying means ⁇ said imaginary cylinder surface being of elliptical cross-section.
  • feed members are a pair of coaxial transport rollers ⁇ said conveying means further including stationary' arcuate guide elements partly enveloping said transport rollers for holding said extremities in the notches thereof during movement of said workpieces to said stretching means ⁇ the guide elements of said conveying means peripherally overlapping the guide elements of said stretching means at said transfer point.
  • said transport rollers being linked with said drawing rollers for joint rotation by said drive means to advance said workpieces along an imaginary cylinder surface of circular cross-section tangent at said transfer point to said imaginary cylinder surface of elliptical cross-section.
  • rollers of at least one of said pairs each comprise two axially spaced corotating peripherally notched disks and a support wheel close to the associated guide element sandwiched between said disks ⁇ said support wheel being dimensioned to make peripheral contact with the extremities of said workpieces lodged in the notches of said disks.
  • drawing rollers each comprise a pair of axially spaced corotating peripherally notched disks of like diameter with relatively offset axes and with midpoints on said centerline, said disks being separately coupled to said drive means.
  • drawing rollers each further comprise a support wheel close to the associated guide element sandwiched befriction layer and being coupled with said drive means for setting said workpieces in rotation about their individual axes within said notches.
  • said friction layer being located at the level of said notches for urging said extremities against the associated stationary guide element.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Treatment Of Fiber Materials (AREA)
US410383A 1972-10-27 1973-10-29 Apparatus for lengthening cylindrical workpieces Expired - Lifetime US3879185A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR7238862A FR2204581B1 (de) 1972-10-27 1972-10-27
DE19732352921 DE2352921A1 (de) 1972-10-27 1973-10-22 Vorrichtung zum ziehen zylindrischer koerper
GB4953773A GB1408229A (en) 1972-10-27 1973-10-24 Lengthening cylindrical workpieces
US410383A US3879185A (en) 1972-10-27 1973-10-29 Apparatus for lengthening cylindrical workpieces

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7238862A FR2204581B1 (de) 1972-10-27 1972-10-27
US410383A US3879185A (en) 1972-10-27 1973-10-29 Apparatus for lengthening cylindrical workpieces

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US3879185A true US3879185A (en) 1975-04-22

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US410383A Expired - Lifetime US3879185A (en) 1972-10-27 1973-10-29 Apparatus for lengthening cylindrical workpieces

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US (1) US3879185A (de)
DE (1) DE2352921A1 (de)
FR (1) FR2204581B1 (de)
GB (1) GB1408229A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112897868B (zh) * 2021-03-26 2023-08-11 双峰格雷斯海姆医药玻璃（丹阳）有限公司 一种玻璃移液管高效加工成型工艺及加工设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US614841A (en) * 1898-11-29 Machine for making vials
US1055402A (en) * 1911-01-07 1913-03-11 Kimble Glass Co Vial-bottoming machine.
US1688190A (en) * 1926-06-04 1928-10-16 Ruth Glass Company Machine for forming glass vials
US2103585A (en) * 1935-02-21 1937-12-28 Kimble Glass Co Method and apparatus for shaping bodies

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973660C (de) * 1943-05-08 1960-04-28 Walter Wienrich Maschine zum Bearbeiten von abgepassten Glasroehren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US614841A (en) * 1898-11-29 Machine for making vials
US1055402A (en) * 1911-01-07 1913-03-11 Kimble Glass Co Vial-bottoming machine.
US1688190A (en) * 1926-06-04 1928-10-16 Ruth Glass Company Machine for forming glass vials
US2103585A (en) * 1935-02-21 1937-12-28 Kimble Glass Co Method and apparatus for shaping bodies

Also Published As

Publication number Publication date
GB1408229A (en) 1975-10-01
FR2204581B1 (de) 1977-07-29
DE2352921A1 (de) 1974-05-02
FR2204581A1 (de) 1974-05-24

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